Sure, birthdays are year-round, the holidays are the busy season when it comes to cards. Why waste time getting some old-fashioned, cookie-cutter card from the corner store when you can make and send your own, personalized, perfect greeting card with an app from the App Store. Cards by Apple, Ink Cards by Sincerely Ink, and Go Cards by Hallmark all allow you to create and send greeting cards straight from your iPhone. But which one is best for the holidays, and best for you?